Should I be worried?

The day before I'm supposed to get my period, I had unprotected sex and he cum inside of me. Afterwards, my period didnt come at all. I also felt pain during sex and when I pee after. Then during these past few days my apetite has increased enormously and I can't stop eating. My period is several days late still! Am I at risk? I am not trying to conceive.. I just made a mistake because I expected my period to arrive on time.